Pentium 1405 V2 's Advantages
Released 3 years and 10 months late
Higher specification of memory (DDR3-1333 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (6MB vs 4MB)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (40W vs 80W)
Intel Xeon E5503 's Advantages
Higher base frequency (2GHz vs 1.4GHz)